Added 'master' branch filter to .travix.yml for Docker image builds
Added 'master' branch filter to .travix.yml for Docker image builds

Signed-off-by: Rick Osowski <79ed53c1a2a1cff0f65f312599afb6cf365ba50b@gmail.com>

gameontext/gameon-mediator,gameontext/gameon-parser,gameontext/gameon-mediator,gameontext/gameon-parser,gameontext/gameon-mediator,gameontext/gameon-parser